Use of Ultrafast Time-Resolved Spectroscopy to Demonstrate the Effect of Annealing on the Performance of P3HT: PCBM Solar Cells

Yu Ting Wang, Mei Hsin Chen*, Chao Ting Lin, Jian Jhih Fang, Che Jui Chang, Chih-Wei Luo, Atsushi Yabushita, Kaung-Hsiung Wu, Takayoshi Kobayashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The organic solar cells of heterojunction system, ITO/PEDOT:PSS/P3HT:PCBM/Al, with a thermal annealing after deposition of Al exhibit better performance than those with an annealing process before deposition of Al. In this study, ultrafast time-resolved spectroscopy is employed to reveal the underlying mechanism of annealing effects on the performance of P3HT:PCBM solar cell devices. The analyses of all decomposed relaxation processes show that the postannealed devices exhibit an increase in charge transfer, in the number of separated polarons and a reduction in the amount of recombination between excited carriers. Moreover, the longer lifetime for the excited carriers in postannealed devices indicates it is more likely to be dissociated into photocarriers and result in a larger value for photocurrent, which demonstrates the physical mechanism for increased device performance.

Original languageEnglish
Pages (from-to)4457-4462
Number of pages6
JournalACS Applied Materials and Interfaces
Volume7
Issue number8
DOIs
StatePublished - 4 Mar 2015

Keywords

  • annealing effect
  • organic solar cells
  • ultrafast dynamics
  • POLY(3-HEXYLTHIOPHENE)
  • GENERATION
  • SNAPSHOTS
  • FULLERENE
  • DYNAMICS

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